Electric burglar alarm



Juiy 12, 1949. K. REGAN ELECTRIC BURGLAR ALARM Filed March 1, 1948 fi mwra.

ATTORNEYS ER J1 Patented July 12, 1949 w s s sQr-s -s LAB-Aman Katharine .Be aa Grieg,

@pplicatign r t 1, 1948, Serial No. 12,430

This invention relates to improvements in burlar alarms of the classin which a sash, door or other closures beconiethe medium of actuation for thealarm.'

An object of the invention is to provide an alarm of this type that I iacture, easilyins'talled andde'si'gned to operate on a'il'ow' voltage electric ciir'rent. 'Theiburglar alarm embodying the invention may be used inhomes or'offic'es; on automobiles through a closure.

The alarm may be used with a house door bell wiring system or any place that a hell or voltage reducer is installed. On automobiles, it can be connected directly to the battery and horn.

The alarm will sound continuously until the switch controlling the system has been turned off, or until each unit has been nullified.

On an unoccupied house, it would notify the police and neighbors that someone is attempting to gain access thereto.

With the above and other objects and advantages in view, the invention consists of the novel details of construction, arrangement and combination of parts more fully hereinafter described, claimed and illustrated in the accompanying drawing in which:

Figure 1 is a partial elevational view of a closure having a signal embodying the invention mounted for cooperation therewith, and interpolated in the bell wiring of the habitation;

Figure 2 is a vertical, sectional view on the line 2-2 of Figure 3, with the alarm in inoperative position;

Figure 3 is a vertical, sectional view on the line 3-3 of Figure 2;

Figure 4 is a cross sectional view on the line 4-4 of Figure 2;

Figure 5 is a cross sectional view on the line 5-5 of Figure 2;

Figure 6 is a view similar to Figure 2, with the alarm in operating position and Figure '7 is a View similar to Figure 3, with the alarm in operating position.

Referring more in detail to the drawing, the reference numeral l0 designates the alarm embodying the invention.

The alarm comprises a box-like body I I, which is made of a colored plastic material. The color of the plastic is adapted to harmonize with the support to which it is attached.

In Figure 1, the alarm I0 is shown mounted on a window frame l2, having a Window sash [3. The mounting of the alarm I0 is accomplished by v1 Qlaim. (or. sto es) isinexpensive to manu- ,u" is'provided'with two and fasteners .15 Reta ns thr he .re sitablaisce pi elit nte e was I Theinner face of the rear walllS of the body i yfld snqse nared grooves i and l 'l"'respe'ctively',' in which repositioned th'springy metal'coriductors ltfahdlfl' respectively. Secnred'ftdtlie inner face" of the rear wall 'l6 over the conductors the plastic plate lll'tliat l8 and IB"resp ect'Vely'is I I retains the conductors in their respective grooiles. The lower 'ei'idoi each conductor has a "foot portion 20 which engages the inner face of the bottom wall 2| of the body II, and a post 22 is connected to each foot portion 20 of the conductors.

Wires 23 connected to the posts are interpolated in the bell wiring system 24 of the house in which the frame [2 is installed.

The upper end of each conductor is formed in a contact helical 25, which, curving downward, will, in non-contacting position, rest on or engage the outer face of the plate l9.

Slidably engaging the plate I9, is the contact blade 26. The outer ends of the blade are rolled over at 21 to engage the lower ends of the parallel portions 28 of the U-shaped actuating member 29. The blade is soldered at its engagement with the portion 28 to prevent the blade from becoming loosened from the ends. The parallel portions 28 of the member 29 extend upwardly and outwardly of the body ll, through spaced openings 29' formed in the top wall 2| of the body I I.

The cross piece 30 of the member 29, outwardly of the body I l, is provided with an eye formation 3|, to which a cord 32 is connected, and the cord 32 has a snap hook 33 connected to its free end.

The cover l5 has a centrally located, vertically disposed guide plate 34 adhesively affixed thereto, and the plate engages the blade 26 to retain it in fully sliding engagement with the plate IS. The plate 34 is interposed between the helicals 25 of the conductors l8.

Adhesively connected to the plate IS, in horizontal relation thereto, and in contact with the lower edge of the plate 34, is the stop or rest plate 35, on which the blade 26 rests when the alarm is in non-sounding position.

In use, the alarm H) is fixed to a support, as previously described. The cord 32 is trained through guide screw eyes 36 affixed to the sup port, and the snap hook 33 is engaged with a screw eye 31 in the sash l3.

Should anyone attempt to raise the sash [3, the cable 32 will be pulled, exerting an upward movement on the member 30 to contact with the helicals 25 to energize and the bell 38 in the system 24.

It will be noted that the upper edge of the blade 26 is sharpened as at 33 to provide a knife edge whereby the blade Will easily slip under the helicals 25. Once engaged with the helicals, the helicals Will hold the blade in this position until the member 29 is pushed downwardly by the owner of the house in which the alarm is installed.

In installation, the body ll must be fastened so that the blade 25 will move in a vertical plane. Thus the plate 34 will always maintain the blade in true operating relation to the helicals 25.

While the invention has been shown and described in use with a window sash, it is to be understcod that it can be used with any type of closure that must be opened, to gain access to the enclosure on which the closure is mounted.

It is believed that from the foregoing description, the manner of construction and operation of the alarm will be apparent to those skilled in the art, and it is to be understood that changes in the minor details of construction, arrangement and combination of parts may be resorted to, provided they fall within the spirit of the invention and the scope of the appended claim.

Having thus described the invention, what is raise the blade 26 into sound claimed as new and desired to be secured by Letters Patent is:

A device of the character described, comprising a box-like body, vertical grooves in the body, conductors in the grooves, a helical formation at the upper end of each conductor, posts connected to the lower ends of the conductors for connecting the conductors to an electrical circuit, an insulating plate over the conductors adapted to hold the conductors in their respective grooves, a contact blade slidably engaging the plate, a U- shaped member passing through the upper end of the body and connected to the blade to slide the blade into engagement with the helical formation of the conductors, a knife edge on the blade to permit easy insertion of the blade into the helical formation, a rest plate for the blade and a guide plate for the blade, both carried by the body.

. KATHYRINE REGAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Terbeck Jan. 1, 1924 

